21111220202 has 8 divisors (see below), whose sum is σ = 31669677156. Its totient is φ = 10554661152.

The previous prime is 21111220199. The next prime is 21111220223. The reversal of 21111220202 is 20202211112.

It can be written as a sum of positive squares in 2 ways, for example, as 20480758321 + 630461881 = 143111^2 + 25109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446333 + ... + 491360.

Almost surely, 2^21111220202 is an apocalyptic number.

21111220202 is a deficient number, since it is larger than the sum of its proper divisors (10558456954).

21111220202 is a wasteful number, since it uses less digits than its factorization.

21111220202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948952.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21111220202 its reverse (20202211112), we get a palindrome (41313431314).

It can be divided in two parts, 211112 and 20202, that multiplied together give a palindrome (4264884624).

The spelling of 21111220202 in words is "twenty-one billion, one hundred eleven million, two hundred twenty thousand, two hundred two".